
MICRO EXPRESS, INC.

FOREX 486 CACHE

Processor         80486SX/80487SX/80486DX/80486DX2
Processor Speed   20/25/33/50 (internal)/50/66 (internal)MHz
Chip Set          FOREX
Max. onboard DRAM 32MB
Cache             64/128/256KB
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       32-bit VESA local bus slots (2)
NPU Options       None

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                 Location

  External battery            JP2       Turbo switch              JP15

  Reset switch                JP3       Turbo LED                 JP16

  Power LED & keylock         JP9       32-bit VESA local bus      S1
                                        slot

  Speaker                    JP10       32-bit VESA local bus      S2
                                        slot

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch         Position

     Factory configured - do not            JP5                N/A
      alter

     CMOS memory normal operation           JP6                Open

      CMOS memory clear                      JP6               Closed

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      1MB         (4) 256K x 9       NONE

      2MB         (4) 256K x 9   (4) 256K x 9

      4MB         (4) 1M x 9         NONE

      5MB         (4) 256K x 9    (4) 1M x 9

      8MB         (4) 1M x 9      (4) 1M x 9

      16MB        (4) 4M x 9         NONE

      20MB        (4) 1M x 9      (4) 4M x 9

      32MB        (4) 4M x 9      (4) 4M x 9

                    CACHE CONFIGURATION

     Size          Bank 0         Bank 1          TAG

     64KB        (4) 8K x 8     (4) 8K x 8    (1) 8K x 4

     128KB      (4) 32K x 8        NONE       (1) 8K x 4

     256KB      (4) 32K x 8    (4) 32K x 8    (1) 32K x 4

                        CACHE JUMPER CONFIGURATION

    Size          JP8A           JP8B           JP8D            JP8E

    64KB       pins 1 & 2     pins 2 & 3      pins 1 & 2      pins 2 & 3
                 closed         closed         closed          closed

   128KB       pins 2 & 3     pins 1 & 2      pins 2 & 3      pins 1 & 2
                 closed         closed         closed          closed

   256KB       pins 2 & 3     pins 1 & 2      pins 2 & 3      pins 1 & 2
                 closed         closed         closed          closed

          VESA WAIT STATE/BUS SPEED (ID2 &AMP; ID3) CONFIGURATION

    CPU speed        Wait states        JP102 (ID2)        JP103 (ID3)

       33MHz       0 wait states        pins 1 & 2         pins 1 & 2
                                          closed             closed

      > 33MHz        1 wait state        pins 2 & 3         pins 2 & 3
                                          closed             closed

                          CPU SPEED CONFIGURATION

      Speed             JP7A               JP7B               JP7C

      20MHz           pins 2 & 3        pins 1 & 2      pins 1 & 2 closed
                       closed             closed

      25MHz           pins 1 & 2        pins 2 & 3      pins 1 & 2 closed
                       closed             closed

      33MHz           pins 1 & 2        pins 2 & 3      pins 2 & 3 closed
                       closed             closed

     50i MHz          pins 1 & 2        pins 2 & 3      pins 1 & 2 closed
                       closed             closed

      50MHz           pins 2 & 3        pins 2 & 3      pins 2 & 3 closed
                       closed             closed

     66i MHz          pins 1 & 2        pins 2 & 3      pins 2 & 3 closed
                       closed             closed

                          CPU TYPE CONFIGURATION

        Type            JP12          JP13         JP29          JP30

    80486SX/PQFP      pins 2 & 3   pins 2 & 3    pins 2 & 3    pins 2 & 3
                       closed        closed       closed        closed

    80486SX/PGA       pins 2 & 3   pins 2 & 3    pins 2 & 3    pins 2 & 3
                       closed        closed       closed        closed

    80487SX/PGA       pins 1 & 2   pins 1 & 2    pins 2 & 3    pins 2 & 3
                       closed        closed       closed        closed

    80486DX/PQFP      pins 2 & 3   pins 2 & 3    pins 2 & 3    pins 2 & 3
                       closed        closed       closed        closed

    80486DX/PGA       pins 1 & 2   pins 1 & 2    pins 1 & 2    pins 1 & 2
                       closed        closed       closed        closed

   80486DX2/PQFP      pins 2 & 3   pins 2 & 3    pins 2 & 3    pins 2 & 3
                       closed        closed       closed        closed

    80486DX2/PGA      pins 1 & 2   pins 1 & 2    pins 1 & 2    pins 1 & 2
                       closed        closed       closed        closed

